Observations on the systematics, development, and habits of Erginulus clavotibialis (Opiliones: Cosmetidae)

Publication Type:Journal Article
Year of Publication:1976
Authors:M. L. Goodnight, Goodnight C. J.
Journal:Transactions of the American Microscopical Society

Erginulus clavotibialis (Cambridge, 1904) Goodnight & Goodnight, 1976 is a relatively large opilionid which is found in a wide variety of habitats in southern Mexico, Yucatan, Belize, and Guatemala. It is often found in small groups of 2-3 individuals under moist logs or rocks in suitable moist habitats. Because of its size and activity and omnivorous habits, it probably plays an important role in the ecology of the areas in which it is common. A study of the structures and characters used for its classification indicates that the number of tarsal segments, general spination of the dorsum and legs, the color pattern, and form of the penis are all important; the number of tarsal segments is least variable and that of the color pattern most variable. The female remains with the eggs after they are deposited in suitably moist spots. They hatched in 23-27 days at 20 C; the young remained with the female for ca. four days and then scattered. There were six nymphal stages, and the final molt was undergone 121 days after hatching.

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